*Nikkei falls 5.1 percent as stronger yen drags
*Grim forecasts from Best Buy, Intel weigh on tech exporters
*Advertising firm Dentsu tumbles in symbol of corporate pain (Adds stocks, details)
By Elaine Lies
TOKYO, Nov 13 (Reuters) - The Nikkei average sank 5.1 percent on Thursday as a strong yen and a wave of grim earnings forecasts from the United States boosted worries about the global economy, dragging tech exporters such as Sony Corp <6758.T> lower.
In a sign of the pain being felt across Japan's corporate sector, Dentsu Inc <4324.T>, the nation's largest advertising company, fell 8.2 percent after it cut its annual profit outlook by 20 percent on Wednesday. [
]Nippon Sheet Glass <5202.T> and Asahi Glass <5201.T> tumbled after the European Commission on Wednesday imposed its highest ever cartel penalty, fining a group of companies including them more than 1.3 billion euros. [
]Consumer electronics makers were especially pressured after Best Buy <BBY.N>, the largest U.S. electronics chain, slashed its forecast, saying that consumers were cutting back on spending amid the deepening economic crisis in one of the biggest destinations for Japanese goods.
"There isn't a lot of light right now," said Hiroaki Osakabe, a fund manager at Chibagin Asset Management.
"With so many grim forecasts and the situation in developing nations growing worse, things are tough."
The dollar managed to claw higher against the yen by midday, after the Japanese currency soared on Wednesday as investors shunned risky assets after comments by U.S. Treasury Secretary Henry Paulson heightened concerns about the economy and sparked a global sell-off in equities <JPY=>.
"When risk aversion really starts to rise, you get a vicious cycle of falling stocks, low oil prices and a higher yen, all of them feeding into each other," said Nagayuki Yamagishi, a strategist at Mitsubishi UFJ Securities.
Paulson said the Treasury's focus now would be on shoring up financial institutions with direct investments as the government backed away from using its $700 billion bailout to buy up bad mortgages, adding to uncertainty about how the government plans to revive bank lending. [
]But Chibagin Asset's Osakabe said that while the comments had probably been behind the sharp falls shortly after the opening, their direct impact had apparently faded, noting that while bank shares were weak, they were far from the hardest hit.
CONSUMER ELECTRONICS CRUMBLE
Adding to the woes of electronics firms was a shock profit warning from U.S. tech bellwether Intel Corp <INTC.O>, which cut its fourth-quarter revenue forecast by 14 percent and said demand is weak in all market segments and geographies [
].The announcement hammered U.S. tech shares, with the Philadelphia Semiconductor Index <.SOXX> tumbling 5 percent.
Sony lost 7.5 percent to 2,025 yen, while Canon Inc <7751.T> shed 5.4 percent to 2,875 yen, becoming one of the top drags on the Nikkei 225 by volume weight. Panasonic Corp <6752.T> fell 6 percent to 1,404 yen.
Dentsu tumbled to 152,100 yen after slashing its profit forecast, with its clients cutting their advertising budgets as high raw material prices, a stronger yen and a faltering economy eat into their profits. [
]The firm, which ranks fifth in the global advertising market, cut its operating profit forecast for the full year to March to 45.3 billion yen ($463.1 million), short of a consensus of 51.2 billion yen in a poll of 13 analysts by Reuters Estimates.
Bank shares weakened after the Nikkei business daily said on Thursday that Mizuho Financial Group <8411.T> is considering issuing preferred subscription securities to Japanese insurance companies this year as a way to increase its capital by around 300 billion yen. [
]Shinichiro Matsushita, an analyst for Daiwa Securities Co Ltd, said moves by Japanese banks to boost capital were raising concerns among investors.
Japan's top bank, Mitsubishi UFJ Financial Group <8306.T>, said last month it will raise up to 990 billion yen to replenish its capital base.
"There are worries about a possible worsening in the near-term supply and demand balance. It is a very good thing for the longer term but leads to dilution worries for people concerned about the short term," he added.
Mitsubishi UFJ <8306.T> lost 4.4 percent to 588 yen, while No. 2 bank Mizuho fell 5.1 percent to 258,600 yen. Sumitomo Mitsui Financial Group <8316.T> dropped 6.5 percent to 374,000 yen.
Asahi Glass slid 6.5 percent to 507 yen and Nippon Sheet Glass fell 9.6 percent to 312 yen, as the two companies said they would review their profit forecasts in the wake of the European Commission's decision. [
]Pilkington -- a UK unit of Nippon Sheet Glass -- will be fined 370 million euros, Asahi 113.5 million and Belgium's Soliver 4,396 million for "discussing target prices, market sharing and consumer allocation," the Commission said.
Trade was light on the Tokyo exchange's first section, with 944 million shares changing hands, compared with last week's morning average of 1.1 billion.
Declining stocks outnumbered advancing ones by nearly 10 to 1. (Reporting by Elaine Lies and Masayuki Kitano; Editing by Chris Gallagher)